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$
999.00
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$32.42 Shipping
Condition: Used
Location: Naperville, United States
This COHERENT LUMENIS Micro-Manipulator ASER APERTURE Laser is an exceptional piece of equipment for any medical or lab facility. With precise laser technology, ... morethis device is perfect for a variety of medical applications. The brand, Coherent, is well-known for its quality and reliability in the industry. This laser is perfect for healthcare, lab, and dental facilities, as well as business and industrial settings. Its versatility is unmatched, and it's sure to be an asset to any workspace. The device is in excellent condition and has been well-maintained, ensuring its optimal performance.
$
650.00
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Condition: Used
Location: Malaysia
For item condition not as described, defective.
$
249.99
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$19.99 Shipping
Condition: Used
Location: Rolla, United States
Great condition, see photos for details8071 CG
$
55.99
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$5.15 Shipping
Condition: Used
Location: Seagoville, United States
$
14.89
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Condition: New
Location: Winnie, United States
For sale is 1 NEW G7 Lens to replace your original lens on your Ortur Laser Master (Original or 2) or other similar diode laser machine. If your original ... morelens is size M9 with 0.5 fine threads, this should work for you.
$
100.00
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Condition: Used
Location: Osseo, United States
GSI Lumonics. Laser Front Aperture. 19.8mm Opening. The Original Manufacturer's warranty does not apply. This is a surplus item. SKU# SB-103700.
$
1000.00
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$60.00 Shipping
Condition: Used
Location: Tampa, United States
It is cleaned and ready to be used. A picture will be listed to show the accessories of the item. The fabric inisde the case is loose due to it being ... moreused previously. Warranty Sticker on Units We will take care of any issues you may have.
$
100.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
Normal 0 false false false EN-US ZH-CN X-NONE Normal 0 false false false EN-US ZH-CN X-NONE Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal ... more0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 830nm 2W 100um Aperture B-Mount Laser Diode Description: Normal 0 This is an 830nm laser diode. Which can output 2W optical power from its 100μm aperture. It was bonded on B-Mount, which was made in the USA. It came to us with a lot of other electronic/opto-electronic related surplus. The laser is brand new not used. Specifications: Characteristics Specification 830nm 2W B-Mount Laser Diode CW output power(W) 2.0. Peak wavelength(nm) 827.44 Spectral width(nm) 1.49 Threshold current(A) 0.36 Operating current(A) 2.03 Slope efficiency(W/A) 1.19 Beam divergence θ ∥ × θ ⊥(deg. 8/30 Wavelength temperature coefficient(nm/ ℃) 0.3. Emitting area(μm) 100 × 1 Lifetime(hour) 10.000. Package. B-Mount Data Sheet. Available for each diode. By Bidding. You must agree and accept: You are over 18 years old and understand the dangers and risks of laser use. And will use this component responsibly. You will use this component in a legal. Safe manner to ensure audience and personnel safety. You have a working knowledge of laser diodes. You understand ESD. And the static sensitivity of this component. Laser beam is harmful for eyes during process. Please avoid any directly see on the aperture. Never shine laser beam on human or animals. You accept these diodes as electronic components for integrating them into a system designed by yourself. You relieve the SELLER. And E-bay from any and all LIABILITY from damage or injury that may arise from use of this laser. If you are not serious. Please do not place a bid. Return policy: We will test the lasers before shipment; buyer should contact us as soon as he find it is defective; Refund request should be made within 14 days buyer receives the product; Replacement request should be made within 30 days buyer receives the product; Since this is a Do-It-Yourse
$
69.99
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Condition: Used
Location: Marietta, United States
Good - Working condition.
$
9.49
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Condition: New
Location: China
Wavelength: 200nm ~ 1100nm. Laser shape: Line 15 °. Lens: Plastic.
$
120.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
This is an 808nm 100um Aperture 3W laser diode. The AR Coating of the laser diode is less than 0.4%. It was p-down bonded on C-Mount, which was made in ... morethe USA. 808nm 100um Aperture C-Mount Laser Diode with Super Low AR.
$
99.00
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Condition: Used
Location: Dallas, United States
LASER's APERTURE APPLICATION. APERTURE SIDE LENS D11 mm. SLIT PRECISION. OPTICAL PRECISION SIGNAL PROCESSOR H.D. READER LENS. LASER WINDOW 10 mm + x0.1 ... moremm. LASER BEAM TOTALLY LINER - NOT DOT ALIKE.
$
43.30
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$6.56 Shipping
Condition: Used
Location: Las Vegas, United States
This lot is for oneNewport PH-10 High-Energy Pinhole Aperture. This unit will arrive in the condition shown, it has a slight bend in the surface (Photograph ... more3). It is being sold AS-IS and WITHOUT WARRANTY as it is too small to mark for warranty purposes.
$
249.99
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$6.55 Shipping
Condition: Used
Location: Revere, United States
It is designed to work at wavelength of 400nm. A Zero Waveplate is constructed of two Crystal Quartz plates that are oriented so the optical axes are ... moreorthogonal. All Special Optics zero-order waveplates are an air-spaced design and comprised of two pieces of Crystal Quartz.
$
199.99
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$12.00 Shipping
Condition: Used
Location: Revere, United States
The reflector is in great condition and the optics are clean. The rugged aluminum and plastic housing is compatible with Newport mounts and components. ... moreHollow Retroreflector. Protected Aluminum. Borofloat® 33.
$
44.99
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Condition: Used
Location: Seagoville, United States
$
120.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
Normal 0 false false false EN-US ZH-CN X-NONE Normal 0 false false false EN-US ZH-CN X-NONE Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal ... more0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 808 nm 1W 50μm Aperture TO-5 Laser Diode with FAC lens Description: This is an 808nm laser diode which can output 1W optical power from its 50μm aperture. The fast axis of the laser diode is collimated by a FAC lens. The laser was p-down bonded on TO-5(9mm TO can) Which was made in the USA. It came to us with a lot of other electronic/opto-electronic related surplus. We have 130 such lasers in stock. The lasers are brand new not used. Specifications: Characteristics Specification 808nm 1W TO-5 Laser Diode with FAC lens CW output power(W) 1.0. Peak wavelength(nm) 808 ± 3 Spectral width(nm) ≤ 4.0. Threshold current(A) ≤ 0.25. Operating current(A) ≤ 1.20. Slope efficiency(W/A) ≥ 1.0. Beam divergence θ ∥ × θ ⊥(deg. 8/1.5 Wavelength temperature coefficient(nm/ ℃) 0.3. Emitting area(μm) 50 × 1 Lifetime(hour) 10.000. Package. TO-5(9mm TO can) No Photodiode. Data Sheet. Available for each diode. By Bidding. You must agree and accept: You are over 18 years old and understand the dangers and risks of laser use. And will use this component responsibly. You will use this component in a legal. Safe manner to ensure audience and personnel safety. You have a working knowledge of laser diodes. You understand ESD. And the static sensitivity of this component. Laser beam is harmful for eyes during process. Please avoid any directly see on the aperture. Never shine laser beam on human or animals. You accept these diodes as electronic components for integrating them into a system designed by yourself. You relieve the SELLER. And E-bay from any and all LIABILITY from damage or injury that may arise from use of this laser. If you are not serious. Please do not place a bid. Return policy:
$
350.00
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Condition: Used
Location: Osseo, United States
Model # : 100035. LPL Laser Systems Lee Laser. LPLS-002 Laser Pinhole Aperture. For Lee Laser LKF-650. NOT an authorized distributor for. The Original ... moreManufacturer's warranty does not apply. This is a surplus item.
$
539.10
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$45.00 Shipping
Condition: Used
Location: Elkin, United States
((InvIDs))348909(((InvIDs))). Phone: (410) 782-0444. "The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and ... morestate and local regulatory agencies. North Carolina 7.00%.
$
8000.00
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$80.00 Shipping
Condition: For parts or not working
Location: Tampa, United States
Without this part, we can't test the item fully.
$
50.00
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Condition: Used
Location: Osseo, United States
Laser Bench/Rail Mounted Aperture. Model # : 0206-03391 Rev E. If you do not have an account No Worries! The Original Manufacturer's warranty does not ... moreapply. This is a surplus item. SKU# SB-109384.
$
200.00
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Condition: Used
Location: Osseo, United States
Model # : 120008. LPL Laser Systems Lee Laser. LPLS-002 Laser Pinhole Aperture. 85% Mirror HR1064. For Lee Laser LKF-650. NOT an authorized distributor ... morefor. The Original Manufacturer's warranty does not apply.
$
200.00
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Condition: Used
Location: Osseo, United States
85% Mirror HR1064. Model # : 120008. LPL Laser Systems Lee Laser. LPLS-002 Laser Pinhole Aperture. For Lee Laser LKF-650. NOT an authorized distributor ... morefor. The Original Manufacturer's warranty does not apply.
$
27.00
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Condition: New
Location: China
Product parameter The following parameters are the laser parameters corresponding to the switching lens, which are for reference only. Wavelength 400-700nm ... moreor 700-1100nm Spot mode Dot Output power 1-3000mw Size 12*30.5mm Optical fiber interface SMA905 Material Aviation aluminum and anodizing Effective focal length10mm Spot size Adjustable Aperture of light 5mm Optical system Optically coated non spherical lens Transmittance>93% Fiber spot Spot size is related to fiber core diameter Divergence angle 0.5mrad Fiber core diameter 4-600um (General)
$
2499.99
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Condition: For parts or not working
Location: Richland, United States
I did my best to try to put a maker to the 3 black devices in photos 2-6, I could not. the laser reflector boxes are interesting and have all different ... morecolor mirror filters on the inside. All parts and pieces are sold as is untested, for parts.
$
95.00
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$18.42 Shipping
Condition: For parts or not working
Location: Cotati, United States
Taking a shot in the dark to describe this lens. I believe this to be a laser or light source beam collimator. The lens surfaces appear to have no visible ... moreissues. My apologies if I got it wrong but still a cool lens set to play with.
$
699.00
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$75.00 Shipping
Condition: Used
Location: Israel
$
45.00
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Condition: Used
Location: Osseo, United States
DTM 10501-00 Laser Prism Mirror For Sinterstation 2500 Plus, OD: 25mm. For Sinterstation 2500 Plus. Laser Mirror. NOT an authorized distributor for. Maple ... moreGrove, MN 55369. 9472 Hemlock Lane N. The Original Manufacturer's warranty does not apply.
$
999.99
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$20.00 Shipping
Condition: Used
Location: Revere, United States
$
58.00
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$14.70 Shipping
Condition: Used
Location: Sacramento, United States
NM Laser Products LST200SLP Laser shutter, INPUT Aperture, ABI 625-1382. You are bidding on what you see in the photos. In stock in California USA. (eBay ... more149)
$
99.00
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$10.40 Shipping
Condition: For parts or not working
Location: Dublin, United States
Difficult to take a picture of.
$
149.99
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$12.50 Shipping
Condition: Used
Location: Revere, United States
The reflector is in great condition and the optics are clean. the mirrors are likely made from protected Aluminum or protected silver. Hollow Retroreflector. ... moreMirror Shape.
$
350.00
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$20.00 Shipping
Condition: New – Open box
Location: Milwaukee, United States
It covers the spectral range from 0.19 to 2.2µm with window installed and to 20µm with window removed. also included is a mount and stand and the original ... morecert.
$
50.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
This is a 975nm laser diode, which can output 1W optical power from its 100μm aperture. It was p-down bonded on TO-5 (9mm TO can), which was made in the ... moreUSA. 975nm 1W TO-5 Laser Diode. Available for each diode.
$
1500.00
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$150.00 Shipping
Condition: Used
Location: Singapore
$
150.00
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Condition: Used
Location: Osseo, United States
Laser Adjustable Mirror Aperture. Office Hours Maple Grove, MN 55369. 9472 Hemlock Lane N. The Original Manufacturer's warranty does not apply. This is ... morea surplus item. SKU# SB-111909.
$
350.00
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Condition: Used
Location: Osseo, United States
Model # : 100035. LPL Laser Systems Lee Laser. LPLS-002 Laser Pinhole Aperture. For Lee Laser LKF-650. NOT an authorized distributor for. The Original ... moreManufacturer's warranty does not apply. This is a surplus item.
$
12.87
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Condition: New
Location: China
Widely used on 780nm 808nm 830nm 880nm 905nm 940nm 960nm 980nm lasers. Effective focal length (EFL): 39mm. It can focus the clear and pure laser beam ... moreat one dot. The light spot is clear after focusing.
$
562.49
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Condition: Used
Location: Seattle, United States
Laser light guide (specs unknown, but manufacturer was likely Edmund Optics). Unable to test ourselves. Light guide aperture holders.
$
58.00
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$14.70 Shipping
Condition: Used
Location: Sacramento, United States
NM Laser Products LST200SLP Laser shutter, INPUT Aperture, ABI 625-1382. You are bidding on what you see in the photos. In stock in California USA. (eBay ... more149)
$
210.00
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$120.00 Shipping
Condition: Used
Location: Singapore
This is used Item in good working condition. all function work as normal picture can see all details.
$
7.49
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Condition: New
Location: China
$
60.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
Normal 0 false false false EN-US ZH-CN X-NONE Normal 0 false false false EN-US ZH-CN X-NONE Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal ... more0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 808nm 2W 100um Aperture B-Mount Laser Diode Description: Normal 0 This is an 808nm laser diode. Which can output 2W optical power from its 100μm aperture. It was bonded on B-Mount, which was made in the USA. It came to us with a lot of other electronic/opto-electronic related surplus. We have 50 such lasers in stock. The lasers are brand new not used. Specifications: Characteristics Specification 808nm 2W B-Mount Laser Diode CW output power(W) 2.0. Peak wavelength(nm) 807.0— 809.0. Spectral width(nm) ≤ 4. Threshold current(A) ≤ 0.4. Operating current(A) ≤ 2.2. Slope efficiency(W/A) ≥ 1.1. Beam divergence θ ∥ × θ ⊥(deg. 8/30 Wavelength temperature coefficient(nm/ ℃) 0.3. Emitting area(μm) 100 × 1 Lifetime(hour) 10.000. Package. B-Mount Data Sheet. Available for each diode. By Bidding. You must agree and accept: You are over 18 years old and understand the dangers and risks of laser use. And will use this component responsibly. You will use this component in a legal. Safe manner to ensure audience and personnel safety. You have a working knowledge of laser diodes. You understand ESD. And the static sensitivity of this component. Laser beam is harmful for eyes during process. Please avoid any directly see on the aperture. Never shine laser beam on human or animals. You accept these diodes as electronic components for integrating them into a system designed by yourself. You relieve the SELLER. And E-bay from any and all LIABILITY from damage or injury that may arise from use of this laser. If you are not serious. Please do not place a bid. Return policy: We will test the lasers before shipment; buyer should contact us as soon as he find it is defective; Refund request should be made within 14 days buyer receives the product; Replacement request should be made within 30 days buyer rec
$
99.00
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Condition: Used
Location: San Jose, United States
This is a used NM Laser 4mm Aperture -- LS200FNC --.
$
52.00
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$9.50 Shipping
Condition: Used
Location: United States
This is a NM Laser Products LST18 Output Aperture in good working order. PLEASE READ THE ENTIRE LISTING BEFORE BIDDING OR YOUR PURCHASE MAY BE CANCELLED. ... moreALL INTERNATIONAL BIDDERS MUST REQUEST A SHIPPING QUOTE BEFORE BIDDING. DUE TO THE NUMBER OF SCAMMERS WE HAVE ENCOUNTERED OUTSIDE OF THE UNITED STATES. WE WILL ONLY SHIP USING USPS EXPRESS MAIL INTERNATIONAL WHICH IS THE ONLY METHOD THAT OFFERS DELIVERY CONFORMATION ON ALL ORDERS OVER 100.00$(this method may be more expensive so please be sure to request a quote before bidding on an item) 2B
$
100.00
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Condition: Used
Location: Osseo, United States
Laser Bench/Rail Mounted Aperture With Filter Lens Mirror. Model # : 0206-03391 Rev E. NOT an authorized distributor for. If you do not have an account ... moreNo Worries! The Original Manufacturer's warranty does not apply.
$
120.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
This is a 785nm laser diode, which can output 2W optical power from its 100μm aperture. It was bonded on C-Mount, which was made in the USA. 785nm 2W ... moreC-Mount Laser Diode with low AR coating. Wavelength temperature coefficient (nm/℃ ).
$
350.00
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Condition: Used
Location: Osseo, United States
Model # : 100035. LPL Laser Systems Lee Laser. LPLS-002 Laser Pinhole Aperture. For Lee Laser LKF-650. NOT an authorized distributor for. The Original ... moreManufacturer's warranty does not apply. This is a surplus item.
$
160.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
This is an 980nm laser diode, which can output 10W optical power from its 400μm aperture. It was bonded on C-Mount, which was made in the USA. 980nm 10W ... moreC-Mount Laser Diode. Wavelength temperature coefficient (nm/℃ ).
$
120.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
This is an 830nm laser diode, which can output 2W optical power from its 50μm aperture. It was bonded on thick C-Mount, which was made in the USA. 830nm ... more2W C-Mount Laser Diode. Wavelength temperature coefficient (nm/℃ ).
$
349.00
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$35.00 Shipping
Condition: Used
Location: Fredericksburg, United States
The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies.
$
45.00
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$4.90 Shipping
Condition: New – Open box
Location: Erie, United States
10mm clear aperture within a 19mm black anodized lens cell.
$
44.99
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$9.99 Shipping
Condition: Used
Location: Cedar Hill, United States
$
10.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
This is a 790nm single mode laser diode, which can output 80mW kink free optical power from its 5μm aperture. It was p-up bonded on TO-18 (5.6mm TO can), ... morewhich was made in the USA. 790nm 80mW TO-18 Laser Diode.
$
299.00
Buy It Now
$20.50 Shipping
Condition: Used
Location: Canton, United States
This Ophir 20C-SH laser power sensor head is a reliable and accurate tool for measuring laser power. With a measuring range of 10mW-4W and a 12mm aperture, ... moreit is suitable for a variety of applications in the medical and industrial fields. The sensor head has been thoroughly tested to ensure that it is in proper working order.The brand of this sensor head is Ophir, and the model is 20C-SH. It falls under the categories of Business & Industrial, Healthcare, Lab & Dental, Medical & Lab Equipment, Devices, Lab Lasers, and Diode Lasers. This product is perfect for those who require precise laser power measurements without having to worry about the condition of the item.Used very good condition.Tested working.Thanks for watching.
$
29.90
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Condition: New
Location: China
CO2 Si mirror By Cloudray Laser Features and specifications: Mateial: Gold-coated Si Wavelength: 10.6 μm Diameter Tolerance: +0/-0.13 mm Thickness Tolerance: ... more±0.25 mm FL Tolerance: 90% Surface Figure:
$
70.00
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$10.00 Shipping
Condition: New
Location: Princeton, United States
Normal 0 false false false EN-US ZH-CN X-NONE Normal 0 false false false EN-US ZH-CN X-NONE Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal ... more0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 Normal 0 830 nm 100mW 5μm Aperture TO-5 Laser Diode Description: This is an 830nm single mode laser diode. Which can output 100mW kink free optical power from its 5μm aperture. It was p-down bonded on TO-5(9mm TO can) which was made in the USA. It came to us with a lot of other electronic/opto-electronic related surplus. We have 55 such lasers in stock. The lasers are brand new not used. Specifications: Characteristics Specification 830nm 100mW TO-5 Laser Diode. CW output power(W) 0.10. Peak wavelength(nm) 830 ± 5. Spectral width(nm) ≤ 1.0. Threshold current(A) ≤ 0.04. Operating current(A) ≤ 0.15. Slope efficiency(W/A) ≥ 0.9. Beam divergence θ ∥ × θ ⊥(deg. 8/30 Wavelength temperature coefficient(nm/ ℃) 0.3. Emitting area(μm) 5 × 1 Lifetime(hour) 10.000. Package. TO-5(9mm TO can) with cathode ground Photodiode. Data Sheet. Available for each diode. By Bidding. You must agree and accept: You are over 18 years old and understand the dangers and risks of laser use. And will use this component responsibly. You will use this component in a legal. Safe manner to ensure audience and personnel safety. You have a working knowledge of laser diodes. You understand ESD. And the static sensitivity of this component. Laser beam is harmful for eyes during process. Please avoid any directly see on the aperture. Never shine laser beam on human or animals. You accept these diodes as electronic components for integrating them into a system designed by yourself. You relieve the SELLER. And E-bay from any and all LIABILITY from damage or injury that may arise from use of this laser. If you are not serious. Please do not place a bid. Return policy: We will test the lasers before shipment; buyer should contact us as soon as he find it
$
25.19
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Condition: New
Location: Ontario, United States
We love keeping the OMTech family on the cutting edge of laser crafting because we know our growth is inseparable from your success. OMTech is a collaboration ... moreof 30-yr industry vets and promising new techs in Anaheim, California.
$
225.00
Buy It Now
$9.95 Shipping
Condition: New – Open box
Location: Stanton, United States
The 10Q20HBS.13S High-energy Nd:YAG Laser 50/50 Beamsplitter is manufactured using high purity fused silica substrates and ultra hard dielectric coatings. ... moreThis beamsplitter has been tested to withstand high-energy pulses and is the ideal choice to work with Spectra-Physics Quanta-Ray lasers.
$
199.00
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Condition: Used
Location: Spicewood, United States
The Coherent / Molectron J25LP-1 Sensor Probe are perfect for tight places or horizontal laser work surfaces. They feature good stability and spatial ... moreuniformity. The J25LP-1 provides excellent flat spectral response due to the absorptive black coating and windowless aperture.
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Former Listings  
 
Adjustable 1/4 Waveplate for Low-Medium Power Lasers 8 mm Aperture
These are 1/4 adjustable waveplates removed from Hewlett Packard/HP 5501 or 5517 metrology lasers. They are made from optical quality mica AR-coated for 633 nm(but should work over a modest range of wavelengths. Though the exact range is not known) The adjustability allows for setting of optimal 1/4 retardation at 633 nm, and to compensate for different wavelengths. They are split into two sections. Rotating the front section with respect to the back section varies the tilt of the waveplate inside, changing retartdation. Since they are made from cleaved mica. Use inside of a laser cavity is not recommended, but they should be fine for controlling the polarization of a free-space beam up to several hundred mW depending on diameter. The clear aperture is about 8 mm. 1/4 waveplates convert from linear to circular or elliptical polarization. ... moreOr vice-versa. This listing is for a one(1) 1/4 waveplate. Overseas buyers please note: The only option is to use the eBay Global Shipping Program. Which may be too costly for an item like this. Thanks for looking. sam
Adjustable 1/4 and 1/2 Waveplate Set for Low-Medium Power Lasers 8 mm Aperture
These are 1/4 and 1/2 adjustable waveplate assemblies removed from Hewlett Packard/HP 5501A metrology lasers. They are made from optical quality mica AR-coated for 633 nm(but should work over a modest range of wavelengths. Though the exact range is not known) The adjustability allows for setting of optimal 1/4 or 1/2 retardation at 633 nm, and to compensate for different wavelengths. They are split into two sections. Rotating the front section with respect to the back section varies the tilt of the waveplate inside, changing retartdation. Since they are made from cleaved mica. Use inside of a laser cavity is not recommended, but they should be fine for controlling the polarization of a free-space beam up to several hundred mW depending on diameter. The clear aperture is about 8 mm. 1/4 waveplates convert from linear to circular or elliptical ... morepolarization. Or vice-versa. 1/2 waveplates allow for the arbitrary rotation of the polarization state. This combination will thus provide any combination of linear/elliptical/circular polarization conversion at an arbitrary angle. This listing is for a set of one(1) 1/4 waveplate and one(1) 1/2 waveplate on a metal ring which allows for easy mounting and adjustment as shown in the last photo. For the additional cost of shipping($10-$15 in the USA) You may have the entire intact but NON-FUNCTIONAL 5501A tube assembly. See my other listing for a description. Send me a note and I will adjust shipping accordingly. Overseas buyers please note: The only option is to use the eBay Global Shipping Program. Which may be too costly for an item like this. Thanks for looking. sam